66963786 has 16 divisors (see below), whose sum is σ = 134162784. Its totient is φ = 22282064.

The previous prime is 66963781. The next prime is 66963791. The reversal of 66963786 is 68736966.

It is an interprime number because it is at equal distance from previous prime (66963781) and next prime (66963791).

It is not an unprimeable number, because it can be changed into a prime (66963781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5985 + ... + 13028.

It is an arithmetic number, because the mean of its divisors is an integer number (8385174).

Almost surely, 2^66963786 is an apocalyptic number.

66963786 is an abundant number, since it is smaller than the sum of its proper divisors (67198998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66963786 is a wasteful number, since it uses less digits than its factorization.

66963786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19605.

The product of its digits is 1959552, while the sum is 51.

The square root of 66963786 is about 8183.1403507455. The cubic root of 66963786 is about 406.0816202878.

The spelling of 66963786 in words is "sixty-six million, nine hundred sixty-three thousand, seven hundred eighty-six".